GRAV3D library is used for carrying out forward modelling and inversion of surface, airborne and/or borehole gravity data in 3D. The forward modelling is accomplished by using an integral equation approach on a tensor grid that computes and stores the (possibly compressed) sensitivity matrix. The inverse problem is solved as an optimization problem that minimizes the earth structure subject to adequately fitting the data and honouring additional specified constraints, including geological constraints that may be communicated directly from GOCAD Mining Suite models.

MAG3D library is used for carrying out forward modelling and inversion of surface, airborne and/or borehole magnetic data in 3D. Arbitrary combinations of field components in borehole, surface, and airborne surveys can be inverted simultaneously. The forward modelling is accomplished by using an integral equation approach on a tensor grid that computes and stores the (possibly compressed) sensitivity matrix. The inverse problem is solved as an optimization problem that minimizes the earth structure subject to adequately fitting the data and honouring additional specified constraints, including geological constraints that may be communicated directly from GOCAD Mining Suite models.

EM1DFM inverts any type of geophysical frequency domain loop-loop EM data to find one of four types of 1D models, with one of four variations of the inversion algorithm. Many permutations of model type, data type, and algorithm choice are possible. The inverse problem is solved as an optimization problem that minimizes the earth structure subject to adequately fitting the data and honouring additional specified constraints, including geological constraints that may be communicated directly from GOCAD Mining Suite models.

EM1DTM inverts geophysical time domain EM data (B or dB/dt) from inductive sources to recover a 1D conductivity profile of the earth. The model objective function can be varied to provide models that range from ‘smooth’ to ‘blocky’ in accordance with the assumed geology. Variable strategies for estimating the trade-off parameter to balance the model structure and data misfit are provided. The program runs using an interface that allows multiple soundings to be stitched together into a profile. The inverse problem is solved as an optimization problem that minimizes the earth structure subject to adequately fitting the data and honouring additional specified constraints, including geological constraints that may be communicated directly from GOCAD Mining Suite models.